I was not correct. Sound pressure is proportional to cone acceleration, it is second derivative of cone displacement. If we talk about sinus signal it is 180 degrees delayed and in opposite phase with cone movement. So cone movement amplitude limitation when reaching Xmax symmetrically will cause direct H3 THD. Unsymmetrical amplitude limitation will cause H2 THD.
TL;DR
if you have a router and if the faceplate of the tweeter is aluminium and removable then you can router the tweeter faceplate to match the outline of the mid/woofer.
If you are making a two way then conceivably you can put the mid/woofer at the rear of the baffle like the LS3/5A and have the two closer together. You'll need to remodel the crossover.
I ordered SB26STCN-C000-4 and made test speaker box with MW16PN to check is it possible to use SB26STCN cut at 1 kHz.
Actual cut off is at 1.2 kHz.
SPL line of 0.65 V signal, actual SPl level is little lower, I had not calibrated SPL level. Measured in room at 1m from speaker, not gated, only 1/24 octave smoothing is applied.
Distortions.
Higher line is at 2.0V signal, lower is at 0.65 V signal, measured in room at 1 m distance.
Also I find with this measurement MW16PN has some kind of THD issue at 400 and 510 Hz.
But generally no problems, SB26STCN cut at 1.2 kHz have no significantly bigger THD than midbass speakers have.
Actual cut off is at 1.2 kHz.
SPL line of 0.65 V signal, actual SPl level is little lower, I had not calibrated SPL level. Measured in room at 1m from speaker, not gated, only 1/24 octave smoothing is applied.
Distortions.
Higher line is at 2.0V signal, lower is at 0.65 V signal, measured in room at 1 m distance.
Also I find with this measurement MW16PN has some kind of THD issue at 400 and 510 Hz.
But generally no problems, SB26STCN cut at 1.2 kHz have no significantly bigger THD than midbass speakers have.
Last edited:
Wow. Nice work
Hopefully your distortion doesn’t creep up when you start to give them more then a watt,
Hopefully your distortion doesn’t creep up when you start to give them more then a watt,
You may want to measure the distortion of each driver individually to make sure it is where you think it is.
A near-field distortion measurement typically gives cleaner data also.
Not trying to rain on your parade, but if you really have 2-5% distortion from 400-500 Hz at that low a level, many would consider that a lot of distortion.
96 dB at 1 meter is a pretty common higher level distortion test. For example:
https://www.erinsaudiocorner.com/testmethods/
A near-field distortion measurement typically gives cleaner data also.
Not trying to rain on your parade, but if you really have 2-5% distortion from 400-500 Hz at that low a level, many would consider that a lot of distortion.
96 dB at 1 meter is a pretty common higher level distortion test. For example:
https://www.erinsaudiocorner.com/testmethods/
Sure MW16PNW distortion need to be investigated, I think it is higher than normal in 400-500 Hz range.
Seems it is test box resonance as in nearfiled measurements (0.65 V signal) THD is normal, but in SPL line resonance is seen.
